Finding the Fourth Proportional to 113,012.52, 156,119.28 and 90,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113,012.52 : 156,119.28 = 90,321.72 : x
2. Step 2: Convert to fraction form
   113,012.52/156,119.28 = 90,321.72/x
3. Step 3: Cross multiply
   113,012.52x = 156,119.28 × 90,321.72
4. Step 4: Simplify right side
   113,012.52x = 14,100,961,894.76
5. Step 5: Solve for x
   x = 14,100,961,894.76/113,012.52
6. Step 6: Final answer
   x = 124,773.45